Method and device for focussing and diopter compensation of a telescope

ABSTRACT

A telescope comprising a lens ( 3 ) and a focussing member ( 5 ) which can be displaced by means or a focussing adjustment ring ( 12 ), whereby the basic position thereof can be adjusted by a lockable diopter adjustment ring ( 13 ), also comprising a reversing system ( 4 ) and an eyepiece ( 6 ), characterised in that a cam disk ( 20 ) for displacement of the focusing member ( 5 ) is associated with the diopter adjustment ring ( 13 ) when the eyepiece ( 6, 7, 8 ) is used with modifiable enlargement, whereby said cam disk ( 20 ) can be displaced by a value which is dependent upon the diopter adjustment and modification of the enlargement of the eyepiece.

[0001] The invention relates to a method for focusing and dioptercompensation of a telescope and such a telescope, having an objectiveand a focusing element associated with the latter and displaceable by afocusing adjustment ring, whose basic position can be adjusted by alockable diopter adjustment ring, and comprising an inverting system andan eyepiece.

[0002] Such a telescope is disclosed by DE 38 30 620 C2 and illustratedthere in particular as a binocular telescope. The important feature ofthis telescope is a focusing element associated with the objective,which is used both for adjusting the range and also for dioptercompensation. A focusing adjustment ring and a diopter adjustment ringcan be unlocked from each other. In this position, the focusing elementin each of the two telescopes can be adjusted independently of eachother onto an object in accordance with the individual visual power ofthe two eyes for the purpose of sharp imaging. After the two adjustmentrings have been locked, the focusing element in the two telescopes isdisplaced simultaneously by the same amounts in order to adjust to otherobject distances. The outwardly pointing lens elements of the objectiveand of the eyepiece are fixed with respect to the housing of thetelescope so that the focusing adjustment and the diopter compensationare what is known as internal focusing.

[0003] DE 16 94 491 U1 likewise discloses a binocular telescope withinternal focusing. Apart from the common adjustment of the two focusingelements, diopter compensation is also provided in one of the tubes. Forthis purpose, a diopter adjustment ring can be uncoupled from thefocusing adjustment ring. As opposed to the aforementioned telescope,here, by actuating the focusing adjustment ring, first of all thefocusing element in one tube has to be adjusted to an object for thepurpose of definition and then the difference in vision of the other eyein the other tube is compensated for by uncoupling the diopteradjustment ring.

[0004] U.S. Pat. No. 5,491,588 A discloses an afocal telescope withcontinuous magnification changing. For the purpose of a magnificationchange, both a lens element associated with the objective and a lenselement associated with the eyepiece are displaced. For the purpose ofdiopter compensation, the entire eyepiece, together with the lenselement displaced during the magnification change, is additionallydisplaced along the optical axis. In the event of a change inmagnification, it is necessary to refocus.

[0005] U.S. Pat. No. 5,504,624 A likewise discloses an afocal telescopewith continuously variable magnification, in which the lens elementassociated with the eyepiece is displaced together with the lens elementassociated with the objective only for a magnification change. Dioptercompensation is carried out via a separate eyepiece lens group by meansof displacement along the optical axis. The mechanical complexity forthe adjustment of the mutually coupled lens elements for themagnification change is considerable. The additional adjustment of theeyepiece for diopter compensation leads to a change in the length of theoverall system.

[0006] DE 43 42 873 A1 discloses a telescope with two fixed eyepiecefocal lengths. Changing the magnification is carried out by changing alens element in the eyepiece region from a first position to a secondposition. Changes in the object range are compensated for by means ofaxial displacement of the eyepiece. The same applies to the defects inthe eye of the observer, it being necessary for the eyepiece to bereadjusted separately in the event of a change from one eyepiecemagnification to the other. In this system, too, the overall lengthchanges with the correct definition.

[0007] The finding which results from the aforementioned documents isthat, in telescopes with variable eyepiece focal length, the elementsfor the diopter compensation must be arranged behind the magnificationadjusting element in the direction of the light. This achieves theeffect that the lens element responsible for the diopter compensationremains constant during the magnification adjustment.

[0008] By analogy with the term telescope magnification, in thefollowing text, a magnification depending only on the eyepiece focallength will be designated an eyepiece magnification r and an eyepiecewith a variable focal length will be designated an eyepiece withvariable magnification.

[0009] If, however, both the adjusting elements for the magnificationchange and the adjusting elements for the diopter compensation arearranged on the eyepiece, then problems result in the arrangement of anormally additionally further desired movable eyepiece cup for spectaclewearers and non-wearers. An eyepiece cup of this type additionallyenlarges the overall volume of the eyepiece, as a result of which, inbinocular telescopes, the adjustable eye spacing is limited at thebottom and the clearance for the nose of the user is restrictedconsiderably.

[0010] The adjusting elements, which are necessarily located closebeside each other at the eyepiece, make operation more difficult.Inadvertent displacement of one of the elements must be expected.

[0011] The invention was therefore based on the object, in a telescopehaving internal objective focusing and diopter compensation, ofproviding the possibility of changing the eyepiece magnification whichpermits a simple and compact configuration of the eyepiece and ensuresthe constancy of the diopter adjustment during a change ofmagnification.

[0012] According to the invention, in a method of the type mentioned atthe beginning, this object is achieved by the characterizing features ofclaim 1. One advantageous refinement results from the feature ofsubclaim 2.

[0013] According to the invention, in the configuration of a telescopeof the type mentioned at the beginning, this object is achieved by thefeatures of claim 3. Advantageous developments emerge from the featuresof subclaims 4 to 10.

[0014] The important step in order to achieve the set object is to beseen, in a focusing element associated with the objective, in additionto the adjustment for the diopter compensation, of additionallyeffecting an adjustment, dependent on the magnification change of theeyepiece, which keeps the definition constant during the change in themagnification. Starting from a diopter adjustment z₁ with an eyepiecemagnification Γ₁, the diopter adjustment is to change to the valuez₂=(Γ₁/Γ₂)²*z₁ at an eyepiece magnification Γ₂.

[0015] The specified relationship between the adjustment values z₁ andz₂ for the diopter compensation also applies in the case of a continuouschange in the eyepiece magnification. It may be implemented mechanicallyvia a cam disk but in particular when changing over the eyepiecemagnification between a few discrete magnification values.

[0016] The displacement out of the eyepiece of the diopter adjustment,normally having to be performed on the eyepiece in the case of eyepieceswith a variable focal length, relieves the eyepiece considerably from aconstructional point of view. A variable optical element in the eyepieceis dispensed with, as a result of which additional problems in theoptical design disappear. The freedom obtained can be used for improvedoptical performance. On the eyepiece there is only one adjustment ringfor the magnification change. The overall volume of the eyepiece can bekept small, so that a smaller adjustable eye spacing and a greaterclearance for the nose are possible in the case of a binoculararrangement of the telescopes.

[0017] In the drawing, exemplary embodiments are illustratedschematically and will be described in more detail below using thefigures, in which:

[0018]FIG. 1 shows a monocular telescope,

[0019]FIG. 2 shows a binocular telescope,

[0020]FIG. 3 shows an extract from the focusing and diopter adjustingmechanisms,

[0021]FIG. 4 shows a development of a cam disk and

[0022]FIG. 5 shows a view of the cam disk.

[0023] The monocular telescope 1 illustrated in FIG. 1 contains anobjective 3 arranged fixedly in the housing 2, an inverting system 4 andan eyepiece. Assigned to the objective 3 is a focusing element 5, whichis mounted in the housing 2 such that it can be displacedlongitudinally. The eyepiece comprises an outer element 6 arrangedfixedly in the housing 2 and two lens elements 7, 8 located internally,which are arranged such that they can be displaced with respect to eachother. In the left-hand half of the sectional drawing, the adjustment ofhigh eyepiece magnification is illustrated with the lens elements 7, 8located far from each other and, in the right-hand half, the adjustmentwith a lower eyepiece magnification. The mutual displacement of the lenselements 7, 8 is effected by means of rotation on a magnificationadjustment ring 9 and therefore coupled cam guides in the mountingsleeves for the lens elements 7, 8. The cam guides will not be describedfurther, since such adjustments are generally known and are not thesubject of the invention. The imaging correction of the eyepiece isoptimized for the respective magnifications in the end positionsillustrated. For this purpose, for example, an 8-fold and a 12-foldmagnification are provided.

[0024] On the magnification adjustment ring 9 there is an outer toothedring 10, in which a gear wheel 11 rotatably mounted on the housing 2engages. The gear wheel 11 has a geared connection to the diopteradjustment, which will be described in more detail using FIG. 3.

[0025] A focusing adjustment ring 12 and a diopter adjustment ring 13are mounted on the housing 2 such that they can be rotated about acommon shaft 14. The diopter adjustment ring 13 in the illustrationshown on the right is locked by a cylinder element 39 described in moredetail later and can be unlocked by being pulled up. Further details canbe gathered from FIG. 3.

[0026] A worm element 15 which can be moved in the direction of theshaft 14 is coupled to the focusing adjustment ring 12. The worm element15 is connected via a pin 16 to a thrust element 17 mounted on the shaft14 such that it can be displaced. The pin 16 is guided, in a mannerknown per se, in a longitudinal slot 18 fixed in position parallel tothe shaft 14, so that, during rotation of the focusing adjustment ring12, the worm element 15 is moved in the axial direction and, in theprocess, displaces the thrust element 17 along the shaft 14.

[0027] Adjustably connected to the thrust element 17 is a carrierelement 19, on which a cam disk 20 is rotatably mounted. The cam disk 20engages with a lug 21 in a slotted guide 22 which is connected to thediopter adjustment ring 13. When the diopter adjustment ring 13 isunlocked, the cam disk 20 can therefore be rotated about the shaft 14 bythe lug 21 being carried along in the slotted guide 22.

[0028] The cam disk 20 bears with its controlling end face on atransmission rod 23 which, via an intermediate piece guided on a rod 25and a pin integrally molded thereon in the radial direction, isconnected to a holder 24 for the focusing element 5. Instead of aforce-fitting contact between the cam disk 20 and the transmission rod23, a form-fitting connection can also be provided. The holder 24 ispressed on the pin radially against the inner wall of the telescope 1 bya spring and is thus guided without play parallel to the shaft 14.During rotation of the cam disk 20 as a result of actuation of theunlocked diopter adjustment ring 13, the transmission rod 23 and thusthe focusing element 5 are therefore adjusted in accordance with therespective height of the end face of the cam disk 20. A development ofthe height of the end face of the cam disk 20 is illustrated in FIG. 4.When the diopter adjustment ring 13 is locked to the focusing adjustmentring 12 again, the selected diopter adjustment is fixed.

[0029] When the diopter adjustment ring 13 is locked to the cylinderelement 39, there is a geared coupling via the locking elements betweenthe gear wheel 11 and the slotted guide 22. By means of rotation of themagnification adjustment ring 9 on the eyepiece, the cam disk 20 istherefore rotated into the position of the selected magnification andtherefore displaces the focusing element 5 again via the transmissionrod 23. The change in the height of the end face of the cam disk 20corresponds to the value already explained. During actuation of thefocusing adjustment ring 12, the setting of the cam disk 20, adjusted asa function of the magnification change, is maintained. As a result ofthe wide physical separation of the focusing adjustment ring 12 and ofthe diopter adjustment ring 13 from the magnification adjustment ring 9,inadvertent adjustment of the correct diopter compensation and of thefocusing is ruled out.

[0030]FIG. 2 shows a binocular telescope. Arranged on the housing 2 ofthe monocular part of the telescope 1 such that it can be pivoted is asecond telescope housing 26 with the same optical construction. Thepivot axis 27 is aligned with the shaft 14 of the focusing adjustmentring 12 and of the diopter adjustment ring 13, so that this part of thehousing 2 forms the pivoting bridge of the binocular telescope.

[0031] In order to adjust a focusing element 28 in the second telescopehousing 26, a driver 29 is added to the thrust element 17 and engages ina groove 30 at the upper end of a second transmission rod 31. The driver29 is constructed in a manner known per se as a circular segment disk,so that the engagement with the transmission rod 31 is not interruptedduring pivoting of the second telescope housing 26 in order to set theeye width. The rotation of the focusing adjustment ring 12 thereforeacts synchronously on both focusing elements 5, 28.

[0032] For the purpose of sharp binocular imaging, in this exemplaryembodiment, sharp imaging must first be adjusted to an object with theeye associated with the focusing element 28. Following subsequentunlocking of the diopter adjustment ring 13, the focusing element 5 canthen be adjusted via the rotation of the cam disk 20 until anydifference possibly present with respect to the visual acuity of theother eye is compensated for. After that, the diopter adjustment ring 13must be locked again.

[0033] In order to change the eyepiece magnification, in the exemplaryembodiment illustrated, both eyepieces have magnification adjustmentrings 9, 32 which can be actuated independently of each other, optimumcorrection of the imaging performance being provided only in the endpositions and the intention therefore also being for only thesepositions to be used for observation. In this exemplary embodiment, onlythe magnification adjustment ring 9 has a geared connection to the camdisk 20. For the purpose of secure adjustment of themagnification-dependent portion of the diopter adjustment, a safeguardis therefore provided, which permits the diopter adjustment ring 13 tobe unlocked and locked only in the end positions of the magnificationadjustment ring 9. The compensation for the difference in the visualacuity should preferably be performed in the position of the highesteyepiece magnification.

[0034] In this case, the cam disk 20 has on its circumference twosegments with different heights and slopes which, firstly, are matchedto a lower eyepiece magnification Γ₁ and, secondly, are matched to ahigher eyepiece magnification Γ₂. This will be described in more detailusing FIGS. 4 and 5. The transmission ratios between the toothed ring10, the gear wheel 11 and in relation to the actuating element for thecam disk 20 are chosen such that, when the eyepiece magnification ischanged over, the respectively associated segment is brought intocontact with the transmission rod 23. In the case where there are twomagnifications Γ₁, Γ₂ which can be changed over, a rotation of about 90°is preferably provided for the magnification adjustment ring 9 for thechangeover in the magnification. The transmission ratio is set in such away that, in the process, the cam disk 20 and also the diopteradjustment ring 13 are rotated through 180°.

[0035] In the case of a correction of the eyepiece for, for example,three or more discretely adjustable magnifications, correspondingly moresegments can be provided and, on the basis of a matched transmissionratio of the actuating elements, can in each case be brought into theactive position.

[0036] The relative displacement between the two focusing elements 5,28, set in the manner described, takes into account both the differencein the visual acuity of the two eyes and the magnification-dependentvalue based on this of the diopter compensation. During subsequentsynchronous adjustment of the focusing elements 5, 28 as a result ofactuation of the focusing adjustment ring 12, the object respectivelyobserved is seen sharply with both eyes.

[0037] Instead of manual actuation of the magnification adjustment rings9, 32, it is possible to provide electromechanical adjustment. Then, viaa central electronic pushbutton, synchronous adjustment of the eyepiecemagnification can be triggered. In addition, the second transmission rod31 can also be assigned an electromechanically driven second cam diskwhich effects a single magnification-dependent adjustment of the secondfocusing element 28. Given such an arrangement, after the difference inthe visual power of both eyes has been compensated for once, thedefinition is maintained during each magnification change.

[0038] Details of the operative chains already described can be gatheredfrom FIG. 3. The diopter adjustment ring 13 is shown in the unlockedstate in the left-hand half of the sectional illustration and in thelocked state in the right-hand half. Both adjustments are assignedlatching positions 33, 34.

[0039] Connected to the diopter adjustment ring 13 is an inner cylinderelement 35, in which the slotted guide 22 already described for the lug21 on the cam disk 20 is arranged. Introduced into the cylinder element35, at the upper end, is an outer toothing system 36 oriented parallelto the shaft 4 [sic]. In addition, a sleeve 37 is rotatably mounted onthe outer circumference of the cylinder element 35. Integrally molded onthe sleeve 37, at the lower end, is a stop lug 38 which points outwardand engages in a recess 38′ in the housing 2 corresponding to the widthof the stop lug 38.

[0040] An outer cylinder element 39 is inserted into the housing 2 suchthat it can rotate. Underneath the bearing edge for the cylinder element39, the latter contains a toothed ring 40 which points outward and inwhich the gear wheel 11 engages. In addition, on the innercircumferential surface, a toothing system 41 is provided, whichcorresponds to the toothing system 36 of the inner cylinder element 35.In the unlocked, left-hand part of the illustration, the two toothingsystems 36, 41 are disengaged and, in the locked, right-hand part of theillustration, engaged in each other. The lower edge of the cylinderelement 39 includes, over part of its circumference, a ledge 42corresponding to the height of the stop lug 38, on which the stop lug 38bears during rotation of the cylinder element 39 on account of actuationof the magnification adjustment ring 9. On the boundary of the ledge 42,the cylinder element 39 in each case additionally has a slot orientedupward parallel to the shaft 4 [sic] and corresponding to the width ofthe stop lug 38. Only when the stop lug 38 is opposite this slot is itpossible to unlock the diopter adjustment ring 13. During the unlockingaction, the lug 21 on the cam disk 20 slides in the slotted guide 22.

[0041] In the unlocked state, rotation of the outer cylinder element 39and therefore of the magnification adjustment ring 9 is not possible,because of the stop lug 38 fixed in the housing 2. In the locked state,on the other hand, rotation of the outer cylinder element 39 istransmitted directly to the inner cylinder element 35 via the toothingsystem 36, 41, the cam disk 20 being rotated at the same time via thelug 21 located in the slotted guide 22.

[0042] The carrier element 19 for the cam disk 20 can be adjustedvertically on the thrust element 17 and secured by a locking screwfixing. In this case, the cam disk should be brought into the zeroposition via the diopter adjustment ring 13 at a specific magnificationsetting. The focusing element 5 should be aligned for afocal imaging ofthe overall system.

[0043] In its top side, the diopter adjustment ring 13 has a viewingwindow 43 and, on the edge thereof, a diopter scale, not illustrated.Underneath the viewing window 43, a pointer disk 44 is placed rotatablyon the inner cylinder element 35 and coupled to the outer cylinderelement 39 via a tab 45. When the diopter adjustment ring 13 isunlocked, the pointer disk 44 is raised as well and, at the same time,the tab 45 slides in a corresponding recess in the outer cylinderelement 39.

[0044] The diopter adjustment results in relative rotation of the innercylinder element 35 with respect to the outer cylinder element 39, thatis to say the diopter scale is rotated with respect to the pointer disk44 which, in the process, is firmly held by the outer cylinder element39 via the tab 45. Because of the pointer disk 44 always being locatedimmediately under the viewing window 43, no parallax errors arise whenreading the adjusted diopter compensation.

[0045] The locking of the magnification adjustment ring 9, alreadydescribed, means that changing over the eyepiece magnifications can becarried out only with the diopter adjustment ring 13 locked. Therotation transmitted to the outer cylinder element 39 during thechangeover also effects rotation of the diopter adjustment ring 13, sothat the diopter scale and the pointer disk 44 are corotatedsynchronously. The two segment regions of the cam disk 20 which areassociated with the different magnifications have the same cam lengthfor the same diopter adjustments. For the diopter display on the diopteradjustment ring 13, the result is thus the same scale spread, so thatonly a single diopter scale is necessary.

[0046] The cam regions of the end face of the cam disk 20, offset by180° in relation to each other, can be seen from the verticaldevelopment H illustrated in FIG. 4. The angular range from 0° to 0.90°is intended to be provided for the diopter adjustment at Γ₁=8-foldeyepiece magnification, and the angular range from 180° to 270° for thediopter adjustment at Γ₂=12-fold eyepiece magnification. Since dioptercompensation is needed for ± values, the height values H at 45° and 225°correspond to the zero position. The heights H are equal at thesepoints. The transition between the cam regions is configured such thatthe cam disk can slide along on the transmission rod 23 without jumpingduring its rotation for the magnification change.

[0047]FIG. 5 shows a view of the closed cam disk 20 with the integrallymolded lug 21. The two cam regions of different slope for the twoselected magnifications 8× and 12×can clearly be seen. Located betweenthem are a transition region 46 and a region 47 which is not usedbecause of the rotational range of the outer cylinder element 39 beinglimited by the ledge 42 and the stop lug 38.

List of Designations

[0048]1 Telescope

[0049]2 Housing

[0050]3 Objective

[0051]4 Inverting system

[0052]5 Focusing element

[0053]6 Outer element of the eyepiece

[0054]7, 8 Displaceable lens elements

[0055]9 Magnification adjustment ring

[0056]10 Outer toothed ring

[0057]11 Gear wheel

[0058]12 Focusing adjustment ring

[0059]13 Diopter adjustment ring

[0060]14 Shaft

[0061]15 Worm element

[0062]16 Pin

[0063]17 Thrust element

[0064]18 Longitudinal slot

[0065]19 Carrier element

[0066]20 Cam disk

[0067]21 Lug

[0068]22 Slotted guide

[0069]23 Transmission rod

[0070]24 Holder

[0071]25 Rod

[0072]26 Second telescope housing

[0073]27 Pivot axis

[0074]28 Second focusing element

[0075]29 Driver

[0076]30 Groove

[0077]31 Second transmission rod

[0078]32 Second magnification adjustment ring

[0079]33, 34 Latching positions

[0080]35 Inner cylinder element

[0081]36 Toothing system

[0082]37 Sleeve

[0083]38 Stop lug

[0084]38′ Recess in the housing 2

[0085]39 Outer cylinder element

[0086]40 Toothed ring

[0087]41 Toothing system

[0088]42 Ledge

[0089]43 Viewing window

[0090]44 Pointer disk

[0091]45 Tab

[0092]46 Transition region

[0093]47 Unused region

1. A method for focusing and diopter compensation in a telescope havingan objective (3) and a focusing element (5) associated with the latterand displaceable by a focusing adjustment ring (12), whose basicposition can be adjusted by a lockable diopter adjustment ring (13), andcomprising an inverting system (4) and an eyepiece, characterized inthat, when use is made of an eyepiece (6, 7, 8) with variablemagnification, during a change in the magnification, the focusingelement (5) is adjusted by a value dependent on the diopter adjustmentand on the magnification change.
 2. The method as claimed in claim 1,characterized in that, starting from a diopter adjustment z₁ with aneyepiece magnification Γ₁, z₂=(Γ₁/Γ₂)²*z₁ is set as the value of thediopter adjustment at an eyepiece magnification F₂.
 3. A telescopehaving an objective (3) and a focusing element (5) associated with thelatter and displaceable by a focusing adjustment ring (12), whose basicposition can be adjusted by a lockable diopter adjustment ring (13), andcomprising an inverting system (4) and an eyepiece (6), characterized inthat, when use is made of an eyepiece (6, 7, 8) with variablemagnification, the diopter adjustment ring (13) is assigned a cam disk(20) for adjusting the focusing element (5) in such a way that, on thebasis of a change in the eyepiece magnification, the cam disk (20) canbe adjusted by a value dependent on the diopter adjustment and on themagnification change.
 4. The telescope as claimed in claim 3,characterized in that the cam disk (20) is formed as a face cam, whoseend face bears on a transmission rod (23) for adjusting the focusingelement (5).
 5. The telescope as claimed in claim 3, characterized inthat there is a form-fitting connection between the cam disk (20) and atransmission rod (23).
 6. The telescope as claimed in claim 4,characterized in that the cam disk (20) is coupled to a magnificationadjustment ring (9) for changing the eyepiece magnification, in such away that an adjustment of the cam disk (20) takes place only when thediopter adjustment ring (13) is locked as a result of actuation of themagnification adjustment ring (9).
 7. The telescope as claimed in claim6, characterized in that a locking means (38, 38′) is provided whichblocks rotation of the magnification adjustment ring (9) when thediopter adjustment ring (13) is unlocked.
 8. The telescope as claimed inclaim 4, characterized in that, when the use is made of an eyepiece (6,7, 8) with discretely adjustable magnifications, each magnificationadjustment is assigned a segment region of the cam disk (20), which canbe brought into an operative position with respect to the transmissionrod (23) via the magnification adjustment ring (9), for themagnification-dependent diopter adjustment.
 9. The telescope as claimedin claim 8, characterized in that unlocking of the diopter adjustmentring (13) to change the basic position of the focusing element (5) isprovided only in the positions of the magnification adjustment ring (9)associated with the discrete magnifications.
 10. The telescope asclaimed in claim 8, characterized in that the segment regions of the camdisk are equally long for all the adjustable eyepiece magnifications.11. A binocular telescope having two telescopes (1; 26) connected via ahinged bridge, as claimed in claim 3 the focusing adjustment ring (12)and the diopter adjustment ring (13) being rotatably mounted inalignment with the pivot axis (27) of the hinged bridge, characterizedin that the cam disk (20) bears on the transmission rod (23) of onetelescope (1), which is rigidly connected to the hinged bridge, and themagnification adjustment ring (9) associated with this telescope (1) iscoupled to the cam disk (20) when the diopter adjustment ring (13) islocked.
 12. The binocular telescope as claimed in claim 11,characterized in that the outwardly pointing lens elements of theobjective (3) and of the eyepiece (6) are arranged in a fixed manner.